[rand.dist.norm.t]
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@104052 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/random b/include/random
index f1ae33b..6a3dcce 100644
--- a/include/random
+++ b/include/random
@@ -1305,7 +1305,7 @@
class param_type
{
public:
- typedef result_type distribution_type;
+ typedef fisher_f_distribution distribution_type;
explicit param_type(result_type m = 1, result_type n = 1);
@@ -1354,7 +1354,60 @@
};
template<class RealType = double>
- class student_t_distribution;
+class student_t_distribution
+{
+public:
+ // types
+ typedef RealType result_type;
+
+ class param_type
+ {
+ public:
+ typedef student_t_distribution distribution_type;
+
+ explicit param_type(result_type n = 1);
+
+ result_type n() const;
+
+ friend bool operator==(const param_type& x, const param_type& y);
+ friend bool operator!=(const param_type& x, const param_type& y);
+ };
+
+ // constructor and reset functions
+ explicit student_t_distribution(result_type n = 1);
+ explicit student_t_distribution(const param_type& parm);
+ void reset();
+
+ // generating functions
+ template<class URNG> result_type operator()(URNG& g);
+ template<class URNG> result_type operator()(URNG& g, const param_type& parm);
+
+ // property functions
+ result_type n() const;
+
+ param_type param() const;
+ void param(const param_type& parm);
+
+ result_type min() const;
+ result_type max() const;
+
+ friend bool operator==(const student_t_distribution& x,
+ const student_t_distribution& y);
+ friend bool operator!=(const student_t_distribution& x,
+ const student_t_distribution& y);
+
+ template <class charT, class traits>
+ friend
+ basic_ostream<charT, traits>&
+ operator<<(basic_ostream<charT, traits>& os,
+ const student_t_distribution& x);
+
+ template <class charT, class traits>
+ friend
+ basic_istream<charT, traits>&
+ operator>>(basic_istream<charT, traits>& is,
+ student_t_distribution& x);
+};
template<class IntType = int>
class discrete_distribution;
@@ -5123,6 +5176,100 @@
return __is;
}
+template<class _RealType = double>
+class student_t_distribution
+{
+public:
+ // types
+ typedef _RealType result_type;
+
+ class param_type
+ {
+ result_type __n_;
+ public:
+ typedef student_t_distribution distribution_type;
+
+ explicit param_type(result_type __n = 1) : __n_(__n) {}
+
+ result_type n() const {return __n_;}
+
+ friend bool operator==(const param_type& __x, const param_type& __y)
+ {return __x.__n_ == __y.__n_;}
+ friend bool operator!=(const param_type& __x, const param_type& __y)
+ {return !(__x == __y);}
+ };
+
+private:
+ param_type __p_;
+ normal_distribution<result_type> __nd_;
+
+public:
+ // constructor and reset functions
+ explicit student_t_distribution(result_type __n = 1)
+ : __p_(param_type(__n)) {}
+ explicit student_t_distribution(const param_type& __p)
+ : __p_(__p) {}
+ void reset() {__nd_.reset();}
+
+ // generating functions
+ template<class _URNG> result_type operator()(_URNG& __g)
+ {return (*this)(__g, __p_);}
+ template<class _URNG> result_type operator()(_URNG& __g, const param_type& __p);
+
+ // property functions
+ result_type n() const {return __p_.n();}
+
+ param_type param() const {return __p_;}
+ void param(const param_type& __p) {return __p_ = __p;}
+
+ result_type min() const {return -numeric_limits<result_type>::infinity();}
+ result_type max() const {return numeric_limits<result_type>::infinity();}
+
+ friend bool operator==(const student_t_distribution& __x,
+ const student_t_distribution& __y)
+ {return __x.__p_ == __y.__p_;}
+ friend bool operator!=(const student_t_distribution& __x,
+ const student_t_distribution& __y)
+ {return !(__x == __y);}
+};
+
+template <class _RealType>
+template<class _URNG>
+_RealType
+student_t_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p)
+{
+ gamma_distribution<result_type> __gd(__p.n() * .5, 2);
+ return __nd_(__g) * _STD::sqrt(__p.n()/__gd(__g));
+}
+
+template <class _CharT, class _Traits, class _RT>
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+ const student_t_distribution<_RT>& __x)
+{
+ __save_flags<_CharT, _Traits> _(__os);
+ __os.flags(ios_base::dec | ios_base::left);
+ __os << __x.n();
+ return __os;
+}
+
+template <class _CharT, class _Traits, class _RT>
+basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+ student_t_distribution<_RT>& __x)
+{
+ typedef student_t_distribution<_RT> _Eng;
+ typedef typename _Eng::result_type result_type;
+ typedef typename _Eng::param_type param_type;
+ __save_flags<_CharT, _Traits> _(__is);
+ __is.flags(ios_base::dec | ios_base::skipws);
+ result_type __n;
+ __is >> __n;
+ if (!__is.fail())
+ __x.param(param_type(__n));
+ return __is;
+}
+
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_RANDOM